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