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