One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,7,8)(3,6,11,14)(4,9,13,15)(5,10,12,16)(17,18,22,26)(19,23,27,32)(20,24,30,29)(21,25,31,28)(33,34,39,43)(35,44,37,40)(36,42,38,41)(45,47,46,48)(1,3,7,11)(2,6,8,14)(4,12,13,5)(9,16,15,10)(19,27)(21,31)(23,32)(25,28)(33,35,39,37)(34,40,43,44)(36,45,38,46)(41,47,42,48)(2,8)(3,11)(5,12)(9,15)(17,19)(18,23)(20,25)(21,29)(22,27)(24,31)(26,32)(28,30)(33,36,39,38)(34,41,43,42)(35,45,37,46)(40,47,44,48)(1,4)(2,9)(3,5)(6,10)(7,13)(8,15)(11,12)(14,16)(17,19)(18,23)(20,25)(21,29)(22,27)(24,31)(26,32)(28,30)(33,34)(35,44)(36,41)(37,40)(38,42)(39,43)(45,48)(46,47) involution — undirected(1,5)(2,10)(3,4)(6,9)(7,12)(8,16)(11,13)(14,15)(17,20)(18,24)(19,28)(21,23)(22,30)(25,27)(26,29)(31,32)(33,37,39,35)(34,40,43,44)(36,45,38,46)(41,48,42,47)(1,6)(2,3)(4,10)(5,9)(7,14)(8,11)(12,15)(13,16)(17,21)(18,25)(19,29)(20,23)(22,31)(24,27)(26,28)(30,32)(33,38,39,36)(34,42,43,41)(35,45,37,46)(40,47,44,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.