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