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