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