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)(13,14,16,20)(15,19,23,18)(17,21,25,28)(22,27,24,26)(5,7,8,12)(6,9,10,11)(13,15)(14,18)(16,23)(17,22)(19,20)(21,26)(24,25)(27,28)(1,2,3,4)(15,22)(17,25)(18,26)(19,27)(21,28)(23,24)(13,15,16,23)(14,19,20,18)(17,22,25,24)(21,27,28,26)(15,22)(17,25)(18,26)(19,27)(21,28)(23,24) 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.