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