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