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)(12,16)(13,14)(17,18,22,26)(19,27,28,23)(20,24,29,32)(21,25,31,30)(3,8)(4,6)(10,14)(11,16)(17,19)(18,23)(20,25)(21,24)(22,28)(26,27)(29,30)(31,32) involution — undirected(1,3,5,8)(2,6,7,4)(9,11)(10,12)(13,16)(14,15)(17,18)(19,23)(20,24)(21,25)(22,26)(27,28)(29,32)(30,31)(1,4)(2,3)(5,6)(7,8)(9,11)(10,12)(13,16)(14,15)(17,18)(19,27)(20,24)(21,30)(22,26)(23,28)(25,31)(29,32) involution — undirected(9,12)(10,11)(13,15)(14,16)(17,20,22,29)(18,24,26,32)(19,25,28,30)(21,27,31,23)(1,2)(3,6)(4,8)(5,7)(17,21,22,31)(18,25,26,30)(19,24,28,32)(20,27,29,23)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.