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