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