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