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