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