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