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