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