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