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