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