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