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