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