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