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