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