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