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