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