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