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