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