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