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)(19,27)(20,24)(21,33)(22,25)(23,29)(26,34)(28,39)(30,40)(31,38)(32,45)(35,41)(36,43)(37,44)(42,47)(46,48) involution — undirected(2,5)(3,7)(10,13)(11,15)(17,19,21,29,22,30,34,43)(18,23,26,27,25,36,33,40)(20,28,32,41,31,42,44,48)(24,35,37,39,38,46,45,47)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,20,22,31)(18,24,25,38)(19,28,30,42)(21,32,34,44)(23,35,36,46)(26,37,33,45)(27,39,40,47)(29,41,43,48)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(19,29)(21,34)(23,27)(26,33)(28,41)(30,43)(32,44)(35,39)(36,40)(37,45)(42,48)(46,47)(9,11,12,15)(10,14,13,16)(18,25)(20,31)(23,36)(26,33)(27,40)(28,42)(32,44)(41,48)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.