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