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