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