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