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