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