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