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