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