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