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