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