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