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