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)(19,20)(21,27)(22,26)(23,28)(24,29)(25,30)(31,32) involution — undirected(9,10)(11,15)(12,14)(13,16)(17,19,23,30)(18,24,28,31)(20,27,25,26)(21,29,22,32)(1,3,5,4)(2,6,7,8)(9,11,12,16)(10,13,14,15)(17,19)(18,25)(20,28)(21,32)(22,29)(23,30)(24,27)(26,31)(11,16)(13,15)(17,20,23,25)(18,19,28,30)(21,31,22,24)(26,29,27,32)(1,4,5,3)(2,6,7,8)(10,14)(13,15)(17,21,23,22)(18,26,28,27)(19,29,30,32)(20,31,25,24)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.