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