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