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