One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,10)(8,11)(9,12)(13,17)(14,16)(15,18)(19,20)(21,22,26,30)(23,31,34,35)(24,29,25,28)(27,33,36,32)(8,15)(10,16)(11,18)(13,19)(21,23,26,34)(22,27,30,36)(24,33,25,32)(28,35,29,31)(2,4)(5,7)(6,10)(8,13)(9,14)(11,17)(12,16)(15,19)(18,20)(23,32)(24,25)(27,31)(28,29)(33,34)(35,36) involution — undirected(5,8,9,15)(6,11,12,18)(7,13,14,19)(10,17,16,20)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.