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