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