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