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