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