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