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