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