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