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