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