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