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