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