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