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