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