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