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