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