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