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