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