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