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