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