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