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