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