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