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