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