One vertex per element, one color per generator, with an edge from x to x·s.
(2,7)(3,4)(9,10)(11,13)(12,15)(14,16)(18,21)(20,24)(25,29)(28,30) involution — undirected(1,2)(3,8)(4,5)(6,7)(10,11)(14,15)(17,18,23,21)(19,24,27,20)(22,25,31,29)(26,30,32,28)(1,3,6,4)(2,8,7,5)(9,10,13,11)(12,14,16,15)(17,19,23,27)(18,24,21,20)(22,26,31,32)(25,30,29,28)(1,4,6,3)(2,8,7,5)(9,11,13,10)(12,15,16,14)(17,20)(18,19)(21,27)(22,30)(23,24)(25,32)(26,29)(28,31)(9,12,13,16)(10,14,11,15)(17,21,23,18)(19,20,27,24)(22,29,31,25)(26,28,32,30)(1,5,6,8)(2,4,7,3)(17,22,23,31)(18,25,21,29)(19,26,27,32)(20,28,24,30)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.