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