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