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