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