One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,7)(9,13)(10,12)(11,14)(15,16)(17,18,22,19)(20,23,27,25)(21,26,29,24)(28,31,32,30)(33,34)(35,42)(36,39)(37,40)(38,44)(41,47)(43,45)(46,48)(4,11)(8,14)(10,15)(12,16)(17,18,22,19)(20,25,27,23)(21,26,29,24)(28,30,32,31)(33,35,39,40)(34,37,36,42)(38,46,47,43)(41,48,44,45)(2,7)(3,9)(8,14)(10,15)(18,19)(20,27)(24,26)(28,32)(34,36)(37,42)(41,44)(45,48) involution — undirected(1,3,6,9)(2,5,7,13)(4,10,11,15)(8,12,14,16)(17,19,22,18)(20,25,27,23)(21,26,29,24)(28,31,32,30)(33,36,39,34)(35,42,40,37)(38,44,47,41)(43,48,46,45)(1,4)(2,8)(3,10)(5,12)(6,11)(7,14)(9,15)(13,16)(17,20)(18,23)(19,25)(21,28)(22,27)(24,30)(26,31)(29,32)(33,37,39,42)(34,40,36,35)(38,45,47,48)(41,46,44,43)(1,5)(2,9)(3,7)(4,12)(6,13)(8,15)(10,14)(11,16)(17,21)(18,24)(19,26)(20,28)(22,29)(23,30)(25,31)(27,32)(33,38,39,47)(34,41,36,44)(35,43,40,46)(37,45,42,48)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.