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