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