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