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