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